Hot-air furnace.



D. S. RICHARDSON.

HOT AIRFURNAGE.

APPLIGATION FILED 00w. 12, 1912.

1,072,499. Patented Sept 9; 1913.

lllllll COLUMBIA PLANDURAPH CO WASHINGTON, D. c.

, DWIGHT s. RICHARDSON, on" NEW YORK,- N. Y.

HOT-AIR FURNACE.

Specification of Letters Patent.

Patented Sept. 9, 1913 Applicat'ion filed October 12, 1912. Serial No. 725,450.

To cll wiwm it may concern: o a 3 Be it known that I, DwIGH'rS. Brennan- SON, a citizen of the United States, and res1- dent of New York, in the county and State of New York, have invented certain new and useful Improvements in Hot-Air Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, I forming part of this specification, and to the figures and letters of reference marked thereon. 1 M

This invention relates to air heating furnacesof that type wherein the air to be heated is brought in proximity to radiating surfaces of large superficial area, such surfaces usually being formed by the Walls of the combustion chamber or being heated by conduction from the walls of the combustion chamber, and the fines and passages which conduct the gases and heated products away from the same.

The objects of the invention generally stated are to provides. furnace of economical construction well adapted for burning fuel of practica ly any available character with high efficiency and in which the danger of leakage of gas or passage of dust into the air being heated will be overcome Without complicating or increasing the cost of construction.

Referring to the accompanying drawings,-Figure 1 is a perspective view of the body or combustion chamber and radiators of a furnace embodying. the present invention, the fire box, casing, doors, etc, which may be of conventional form being omitted. Fig. 2 is a side elevation of the parts shown in Fig. 1 to which has been added a diagrammatic representation of the casing, firebox and ash pit. Fig. 3 is a top plan of the rear portion of the parts shovvnin Fig.1. Fig. 4 is a section in a vertical plane between adjacent lateral ex tensions of the combustion chamber.

Similar letters of reference in the several figures denote the same parts.

Referring to Fig; 2 the base or ash pit section is indicated conventionally at A, the fire pot section at B, and the casing at C. Air to be heated is admitted to the lower part of the casing as usual, and discharges therefrom at the top through any of the usual arrangements of air ipes, as indicated for example by the dotted line C. The fire pot B is elongated from front to rear, its fuel area preferably terminating at the front a considerable distance from the fire door, as shown by the dotted line 6.

Above the fire box section and with its lower edges fitting the upper edges of said section there is mounted the elongated or longitudii'lally extending combustion cham ber D having. at the front end the fire door opening "cl. At the top the combustion chamber is arched over the fire pot forming a dome D, which is of generally semi-cylindrical form although at the extreme top the curve is of less radius than at the sides to avoid the formation of any transversely extended substantially horizontal area which might tend to cause an eddying of the air currents above the chamber.

The combustion chamber is provided with a series of lateral spaced extensions or arms D on opposite sides and preferably on the lower portion. These extensions or arms are adapted to support the radiators and constitute the normal exits for the gaseous products of combustion and smoke from the combustion chamber.

The radiator on each side is preferably formed in an integral casting so as to avoid joints, and each is composed of a series of sections E adapted at their lower ends to join the lateral extensions or arm's Dt On their inner edges the sections follow generally the contour line of the upper part of the combustion chamber, but are spaced therefrom, The outer edges are preferably substantially verticalwhile the tops are substantially horizontal, although it will be understood that considerable latitude for variation in the particular configuration of the sections is permissible. The sections communicate with each other in those portions which overhang the combustion chamher, through connecting portions E, all arranged in line. Exits from the radiators are formed by the smoke connections F at the rear in line with the openings between the sections, said connections F leading into a transverse smoke box G from which the products are taken away to a suitable stack.

Openings H in the first section corresponding to the shape of the communicating openings between sections are for the purpose of giving access to the interior of the radiators for cleaning and they are to'be normally closed by suitable close fitting covers or doors. I

A direct flue connection Kis provided between the top of the combustion chamber at the rear, and the smoke box G, said connection being provided with a damper L, preferably located outside of the casing.

The radiator sections preferably have their corners and edges rounded and are taper-ed slightly from the inner to the outer edges as shown in Fig. 8.

It will be seen that the form of the com' bustion chamber and relation of the radiator sections to the same provides free passageways for the air in close proximity to a very large radiating surface. Furthermore, the highly heated combustion chamber and air heated directly thereby produces an en training action upon the inflowing. air whereby it is drawn between and into contact with the radiator sections.

It will be noted further that in the preferred construction the radiators and the combustion chamber are each an integral cast-ing; thus, no joints are formed in the upper portion of either where the gas pressure is greatest.

WVhile the arms D as shown, are of considerable length and the joints between them and the radiator sections are horizontal, it is obvious that the length of the arms and the angle of the joints may be varied, as may be found expedient or desirable in the manufacture of the parts and particularly to facilitate casting and assembling.

The elongated fire box with lateral openings through the arms and unbroken dome over the fire is a highly desirable arrangement, both because practically any kind of fuel may be successfully burned and because the heat will be distributed with great uniformity to all parts of the radiating surface of the box and radiators.

With the construction described there is no central obstruction over the combustion chamber, but on the contrary the radiators are spaced from each other at the top, leaving a clear air space with the result that a strong upward flow of air takes place, draw- I ing the air from the sides through between the radiator fines. This construction is notonly highly advantageous, because of the in crease in the air heating and forcing effect, but it does away with the location of fines in'n'nediately over the center of the combustion chamber where experience shows they will be burned and warped or twisted out of shape in a comparatively short time.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is:

1. In an air heating furnace, a longitudinal combustion chamber with extending arms on opposite sides thereof in the lower portion, said arms disposed throughout the length of said combustion chamber, radiators supported on said arms and communieating therewith, the said radiators being spaced from thecombustion chamber and overhanging the same and spaced from each other at the top, and each of said radiators being formed with a plurality of flues spaced from one another forming between them passageways for air to pass over their surfaces.

2. In a hot air furnace, a longitudinal combustion chamber with'spaced exit openings in rows on opposite sides and at the lower portion thereof, radiators having spaced sections forming flu-es overhanging the combustion chamber at their upper ends but spaced therefrom and from each other leaving a central clear air space over the combustion chamber and at their lower ends in communication with the said exit openings, a direct discharge flue leading from the top of the combustion chamber and a discharge flue from the rear of each of the radiators. 3. In a hot air furnace, an elongated combustion chamber having a substantially semi-cylindrical top and having spaced exit openings in rows on opposite sides and at the lower portion thereof, separate radiators spaced from each other at the top and each having vertical, connected, spaced sections forming flues overhanging the combustion chamber with their inner edges conforming to, but spaced from the top of the combustion chamber and at their lower ends in communication with the said exit openings, and discharge ducts for the radiators.

a. In a hot air furnace an elongated combustion chamber having spaced lateral extensions in rows on opposite sides and at the lower portion thereof forming exit openings, separate radiators spaced from each other at the top and each having vertical sect-ions forming flues overhanging the combustion chamber at their upper ends and connected together in their overhanging portions, the lower ends of the sections being supported by and in communication with the lateral extensions and discharge ducts for the radiators.

5. In a hot air furnace, an integral cast metal combustion chamber having an upwardly curved top and lateral extensions in rows on opposite sides at the lower portion thereof, forming exit openings and radiators one on each side spaced from each other at the top to leave a clear air space centrally over the combustion chamber and each an integral casting having spaced sections forming fiues seating at the bottom on the lateral extensions of the combustion chamber and connecting parts between the sections at the top forming communicating openings between the sections, and an exit opening in line with the communicating openings.

6. In a hot air furnace an elongated combustion chamber having a series of exit openings disposed throughout the length of the same on both sides and a radiator on each side having vertically disposed spaced sections overhanging, but spaced from the combustion chamber and from the opposite radiator and forming flues each communicating with one of the exit openings, with connecting parts in each radlator forming communicating openings between the sections, and a common'discharge duct communicating with both radiators at one end of the furnace.

7. In a hot air furnace, an elongated combustion chamber having an upwardly curved top with lateral openings on opposite sides near the lower portion, radiators, one on each side each formed of flue sections in communication at their upper ends and at their lower ends communicating with said side 20 openings in the combustion chamber, a casing inclosing the chambers and radiators, a smoke exit box outside of the casing having separate flue connections with the radiators, a direct draft flue from the smoke box to the top of the combustion chamber, and a damper in said direct draft flue located outside of the casing, whereby leakage of gases into the casing is prevented. I

DWIGHT S. RICHARDSON.

Witnesses: H. T. RICHARDSON, H. L. ANNESS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. i 

